Implement HuggingFace API integration

[Revmagi]

Build HuggingFace repository analysis and model import system.

Tasks

• Implement HuggingFace API client
• Add repository search and analysis
• Build model file detection system
• Implement download URL generation
• Add model import functionality
• Include repository validation

Acceptance Criteria

• HuggingFace repositories can be searched
• Model files are properly detected
• Download URLs generate correctly
• Repository metadata imports accurately
• Validation prevents invalid imports